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Dual LSPR and CT synergy: 3D urchin-like Au@W18O49 enables highly sensitive in-situ SERS detection of dissolved furfural in insulating oils

Assessing the levels of furfural in insulating oils is a crucial technical method for evaluating the degree of aging and mechanical deterioration of oil-paper insulation. The surface-enhanced Raman spectroscopy (SERS) technique provides an effective method for enhancing the sensitivity of in-situ de...

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Published in:Talanta (Oxford) 2025-01, Vol.281, p.126854, Article 126854
Main Authors: Wang, Changding, Lei, Yu, Zhang, Sida, Wang, Ziyi, Wang, Miaolin, Ming, Zifeng, Liu, Ruiqi, Yang, Da, Zhang, Zhixian, Wang, Pinyi, Wan, Fu, Chen, Weigen
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container_title Talanta (Oxford)
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creator Wang, Changding
Lei, Yu
Zhang, Sida
Wang, Ziyi
Wang, Miaolin
Ming, Zifeng
Liu, Ruiqi
Yang, Da
Zhang, Zhixian
Wang, Pinyi
Wan, Fu
Chen, Weigen
description Assessing the levels of furfural in insulating oils is a crucial technical method for evaluating the degree of aging and mechanical deterioration of oil-paper insulation. The surface-enhanced Raman spectroscopy (SERS) technique provides an effective method for enhancing the sensitivity of in-situ detection of furfural. In this study, a homogeneous three-dimensional (3D) urchin-like Au@W18O49 heterostructure was synthesized as a SERS substrate using a straightforward hydrothermal method. The origin of the superior Raman enhancement properties of the 3D urchin-like heterostructures formed by the noble metal Au and the plasmonic semiconductor W18O49, which is rich in oxygen vacancies, is analyzed experimentally in conjunction with density-functional theory (DFT) calculations. The Raman enhancement is further amplified by the remarkable dual localized surface plasmon resonance (LSPR) effect, which generates a strong local electric field and creates numerous "hot spots," in addition to the interfacial charge transport (CT). The synergistic effect of these factors results in the 3D urchin-like Au@W18O49 heterostructure exhibiting exceptionally high SERS activity. Testing the rhodamine 6G (R6G) probe resulted in a Raman enhancement factor of 3.41 × 10−8, and the substrate demonstrated excellent homogeneity and stability. Furthermore, the substrate was effectively utilized to achieve highly sensitive in-situ surface-enhanced Raman scattering (SERS) detection of dissolved furfural in complex plant insulating oils. The development of the 3D urchin-like Au@W18O49 heterostructure and the exploration of its enhancement mechanism provide theoretical insights for the advancement of high-performance SERS substrates. [Display omitted] •3D urchin-like Au@W18O49 heterostructure as a high-performance SERS substrate.•The SERS substrate exhibits a high SERS enhancement factor, excellent homogeneity and long-term durability.•The substrate can be used for the in-situ detection of furfural in complex insulating oil environments.•Experiments combined with DFT calculations reveal the synergistic enhancement mechanism of dual LSPR and CT.
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The synergistic effect of these factors results in the 3D urchin-like Au@W18O49 heterostructure exhibiting exceptionally high SERS activity. Testing the rhodamine 6G (R6G) probe resulted in a Raman enhancement factor of 3.41 × 10−8, and the substrate demonstrated excellent homogeneity and stability. Furthermore, the substrate was effectively utilized to achieve highly sensitive in-situ surface-enhanced Raman scattering (SERS) detection of dissolved furfural in complex plant insulating oils. The development of the 3D urchin-like Au@W18O49 heterostructure and the exploration of its enhancement mechanism provide theoretical insights for the advancement of high-performance SERS substrates. [Display omitted] •3D urchin-like Au@W18O49 heterostructure as a high-performance SERS substrate.•The SERS substrate exhibits a high SERS enhancement factor, excellent homogeneity and long-term durability.•The substrate can be used for the in-situ detection of furfural in complex insulating oil environments.•Experiments combined with DFT calculations reveal the synergistic enhancement mechanism of dual LSPR and CT.</description><identifier>ISSN: 0039-9140</identifier><identifier>ISSN: 1873-3573</identifier><identifier>EISSN: 1873-3573</identifier><identifier>DOI: 10.1016/j.talanta.2024.126854</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Au@W18O49 ; Dual LSPR + CT ; Furfural ; In-situ detection ; Insulating oil ; SERS</subject><ispartof>Talanta (Oxford), 2025-01, Vol.281, p.126854, Article 126854</ispartof><rights>2024 Elsevier B.V.</rights><rights>Copyright © 2024 Elsevier B.V. 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The synergistic effect of these factors results in the 3D urchin-like Au@W18O49 heterostructure exhibiting exceptionally high SERS activity. Testing the rhodamine 6G (R6G) probe resulted in a Raman enhancement factor of 3.41 × 10−8, and the substrate demonstrated excellent homogeneity and stability. Furthermore, the substrate was effectively utilized to achieve highly sensitive in-situ surface-enhanced Raman scattering (SERS) detection of dissolved furfural in complex plant insulating oils. The development of the 3D urchin-like Au@W18O49 heterostructure and the exploration of its enhancement mechanism provide theoretical insights for the advancement of high-performance SERS substrates. 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The synergistic effect of these factors results in the 3D urchin-like Au@W18O49 heterostructure exhibiting exceptionally high SERS activity. Testing the rhodamine 6G (R6G) probe resulted in a Raman enhancement factor of 3.41 × 10−8, and the substrate demonstrated excellent homogeneity and stability. Furthermore, the substrate was effectively utilized to achieve highly sensitive in-situ surface-enhanced Raman scattering (SERS) detection of dissolved furfural in complex plant insulating oils. The development of the 3D urchin-like Au@W18O49 heterostructure and the exploration of its enhancement mechanism provide theoretical insights for the advancement of high-performance SERS substrates. [Display omitted] •3D urchin-like Au@W18O49 heterostructure as a high-performance SERS substrate.•The SERS substrate exhibits a high SERS enhancement factor, excellent homogeneity and long-term durability.•The substrate can be used for the in-situ detection of furfural in complex insulating oil environments.•Experiments combined with DFT calculations reveal the synergistic enhancement mechanism of dual LSPR and CT.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.talanta.2024.126854</doi><orcidid>https://orcid.org/0000-0001-9006-6852</orcidid><orcidid>https://orcid.org/0000-0001-9150-6768</orcidid></addata></record>
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subjects Au@W18O49
Dual LSPR + CT
Furfural
In-situ detection
Insulating oil
SERS
title Dual LSPR and CT synergy: 3D urchin-like Au@W18O49 enables highly sensitive in-situ SERS detection of dissolved furfural in insulating oils
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